Acquisitions (Schedule of Allocation of Purchase Price) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Purchase Price Allocation
Goodwill	$ 1,989,000
Weeden Prime Services LLC [Member]
Purchase Price Allocation
Cash and cash equivalents	301,000
Cash segregated under federal regulations	152,000
Receivables from clearing broker dealers	4,616,000
Furniture, equipment and leasehold improvements, net	41,000
Software, net	51,000
Intangible assets, net	1,057,000
Lease right-of-use assets	214,000
Other assets	271,000
Total Assets acquired	6,703,000
Accounts payable and accrued liabilities	1,353,000
Lease liabilities	214,000
Total Liabilities acquired	1,567,000
Net Assets acquired	5,136,000
Goodwill	1,989,000
Purchase price	$ 7,125,000